I'm surprised you think RG was so muggy in the 90s- guys with similar games to Nadal (with less topspin due to technology) were dominating- Muster and Bruguera for example.
They didn't win enough titles, not really dominating. Chang, Gomez, Kafelnikov, Agassi (Medvedev in final) - really had no business winning RG. It was most wide open slam in the 90's IMO. Even in 2000's there was Gaudio.